Oakleaf hydrangeas (H. quercifolia) grow panicle flowers on rangy stems with attractive, peeling bark. They're native to the United States and super-easy to grow in warm climates, but not hardy enough for much of the Midwest. If you live in Zone 5, an oakleaf is a good low-care option.
Hydrangea paniculata 'Grandiflora' is sometimes called peegee hydrangea. It's a large shrub or small tree to 20 feet tall. Hydrangea paniculata 'Limelight' bears light lime-green flowers from midsummer to fall. It grows 8 feet tall. Full sun to part shade.
some think the Katsura tree smells like caramel or cotton candy when it loses it's leaves in the fall. Besides being wonderful to smell in the fall, the Katsura sports a lovely blend of orange-, raspberry- and apricot-coloured leaves. In the spring Katsura has reddish-purple new growth, in summer it sports heart-shaped blue-green leaves and in winter the gray, slightly exfoliating bark lends interest.